1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.binding.http.wireformat.jsonrpc.provider;
import org.apache.tuscany.sca.binding.http.HTTPBinding;
import org.apache.tuscany.sca.binding.http.HTTPBindingContext;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
import org.apache.tuscany.sca.invocation.Interceptor;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.invocation.MessageFactory;
import org.apache.tuscany.sca.runtime.RuntimeWire;
import org.json.JSONArray;
import org.json.JSONObject;
import org.osoa.sca.ServiceRuntimeException;
import com.metaparadigm.jsonrpc.JSONRPCResult;
/**
* JSON-RPC Wire Format Interceptor
*
* @version $Rev$ $Date$
*/
public class JSONRPCWireFormatInterceptor implements Interceptor {
private Invoker next;
private RuntimeWire runtimeWire;
private HTTPBinding binding;
private InterfaceContract serviceContract;
private MessageFactory messageFactory;
public JSONRPCWireFormatInterceptor(HTTPBinding binding, RuntimeWire runtimeWire, InterfaceContract serviceContract, MessageFactory messageFactory) {
this.binding = binding;
this.runtimeWire = runtimeWire;
this.serviceContract = serviceContract;
this.messageFactory = messageFactory;
}
public Invoker getNext() {
return next;
}
public void setNext(Invoker next) {
this.next = next;
}
public Message invoke(Message msg) {
HTTPBindingContext bindingContext = msg.getBindingContext();
Message returnMessage = null;
if ("smd".equals(bindingContext.getHttpRequest().getQueryString())) {
returnMessage = handleSMDInvocation(msg);
} else {
returnMessage = handleJSONRPCInvocation(msg);
}
return returnMessage;
}
/**
* Handle regular JSON-RPC Invocation
* @param msg
* @return
*/
private Message handleJSONRPCInvocation (Message msg) {
JSONObject jsonReq = (JSONObject) msg.getBody();
String method = null;
Object[] args = null;
Object id = null;
try {
// Extract the method
method = jsonReq.getString("method");
if ((method != null) && (method.indexOf('.') < 0)) {
jsonReq.putOpt("method", "Service" + "." + method);
}
// Extract the arguments
JSONArray array = jsonReq.getJSONArray("params");
args = new Object[array.length()];
for (int i = 0; i < args.length; i++) {
args[i] = array.get(i);
}
id = jsonReq.get("id");
} catch (Exception e) {
throw new RuntimeException("Unable to find json method name", e);
}
Message responseMessage = null;
try {
msg.setBody(args);
responseMessage = runtimeWire.getInvocationChain(msg.getOperation()).getHeadInvoker().invoke(msg);
} catch (RuntimeException re) {
Throwable exception = new RuntimeException("Error invoking service :" + re.getMessage(), re);
return createJSONFaultMessage(re);
}
Object result = null;
if (!responseMessage.isFault()) {
//successful execution of the invocation
try {
result = responseMessage.getBody();
JSONObject jsonResponse = new JSONObject();
jsonResponse.put("result", result);
jsonResponse.putOpt("id", id);
//get response to send to client
responseMessage.setBody(jsonResponse);
return responseMessage;
} catch (Exception e) {
throw new ServiceRuntimeException("Unable to create JSON response", e);
}
} else {
//exception thrown while executing the invocation
Throwable exception = (Throwable)responseMessage.getBody();
return createJSONFaultMessage(exception);
}
}
/**
* handles requests for the SMD descriptor for a service
*/
private Message handleSMDInvocation(Message msg) {
HTTPBindingContext bindingContext = msg.getBindingContext();
String serviceUrl = bindingContext.getHttpRequest().getRequestURL().toString();
JavaInterface interfaze = (JavaInterface) serviceContract.getInterface();
String smd = JavaToSmd.interfaceToSmd(interfaze.getJavaClass(), serviceUrl);
Message smdResponseMessage = messageFactory.createMessage();
smdResponseMessage.setBody(smd);
return smdResponseMessage;
}
/**
* Create a Fault Message with a JSON representation of the current exception
* @param throwable
* @return
*/
private Message createJSONFaultMessage(Throwable throwable) {
Message jsonFaultMessage = messageFactory.createMessage();
JSONRPCResult jsonFault = new JSONRPCResult(JSONRPCResult.CODE_REMOTE_EXCEPTION, null, throwable);
jsonFaultMessage.setBody(jsonFault);
return jsonFaultMessage;
}
}
|
